Expansion shield



March 3, 1931. c. TOMKINSON 1,795,057

EXPANSION SHIELD Filed Jan. 21. 1927 /7 /6 39 F'zgL/Z INVENTOR (/Iar [es6. jbm/rzm'an hZWAqu W A RNEYS Patented Mar. 3, 1931 UNITED STATES"PATENT; OFFICE CHARLES C. TOMKINSON, OF PLAINFIELD, JERSEY, ASSIGNOR, BYMESNE AS- SIGNMENTS, TO J. EDWARD OGDEN COMPANY, OF NEW YORK, N. Y., ACORPORA- TION OF NEW JERSEY EXPANSION SHIELD Application filed January21 1927. Serial No. 162,446.

This invention relates to improvements in expansion shields of thecharacter employed for obtaining anchorage in walls of brick, stone andcementitious material not adapted to directly receive a threaded member.

One of the objects of the invention is to provide an expansion shield soconstructed and arranged as to possess superior gripping qualities.

in Another object of the invention is to provide a device of thecharacter specified that is simple in construction, efficient inoperation and can be economically manufactured.

Further objects of the invention will appear from the followingspecification taken in connection with the drawings, which form a partof this application, and in which Fig. 1 is an elevational view of ashield constructed in accordance with the invention;

Fig. 2 is a longitudinal sectional elevation taken substantially on line22 of Fig. 1;

Fig. .3 is an end view of the inner end of the shield shown in Fig. 1;

Fig. 4 is a transverse sectional elevation taken substantially on line Hof Fig. 2;

Fig. 5 is a longitudinal sectional elevation showing the shield expandedin a wall opening; and

Fig. 6 is a sectional elevation similar to Fig. 2, but illustratinganother embodiment of the invention.

The invention briefly described consists of an expansion shield formedof material of uniform thickness, such as sheet metal, and havingexpansible portions provided with an annular projection adapted to beforced Outwardly by the expanding element into gripping engagement withthe wall opening. In the particular form of the invention illusr trated,the shield has reversed annular channels, one channel extendingoutwardly to form a projection and the other channel extending in theopposite direction. Further details of the invention will appear fromthe following description.

In the particular embodiment of the invention illustrated in Figs. 1 to5 inclusive, the shield comprises a pair of sections 10 and 11,

u preferably formed of metal of uniform thickness, such as sheet metal.The two sections 1 cylindrical in shape.

treme inner end of the shield is bent inwardly as shown at to enclosethe expanding element or nut 21 which is normally disposed in theposition shown in Fig. 2. The nut 21 has a tapered outer surface 22conforming in inclination to the inclination of the tapered end portion17 of the shield and it will be noted that the nut in its normalposition extends beneath or to a position within the projection 16.

The tapered portion 17 of the shield is provided with diametricallyopposed slots 25 which receive oppositely projecting lugs 26 formed onor carried by the nut 21. The engagement of the lugs 26 in the slotsprevents the nut from turning when it is drawn longitudinally in theshield by a bolt 28 or other expanding member. The two sections of theshield are held together by an annular split ring 29. The outer end ofthe shield is preferably flanged as shown at 30.

The operation of the shield is clearly illustrated in Fig. 5 and it willbe seen that as the expanding element or nut 21 is drawn longitudinallyin the shield, the expansible portions of the shield will be forcedoutwardly and the annular projection 16 will be pressed into firmgripping engagement with the wall opening.

In the embodiment of the invention illustrated in Fig. 6, the shield hasan annular proj ection and a tapered end portion 36. The expandingelement 37 for the shield has two tapered portions 38 and 39. When theexpanding element or nut 37 is drawn longitudinally in the shield, thetapered portion 38 will engage the shoulder 40 at the outer end of theannular projection 35 and the tapered portion 39 will engage the taperedend portion 36 of the shield.

From the foregoing description it will be seen that a simple andpractical form of shield has been designed and this shield will form afirm and secure anchorage.

Although certain specific embodiments of the invention have beenparticularly shown and described, it will be understood that the Vinvention is capable of modification and that changes in theconstruction and in the arrangement of the various cooperating partsmaybe made without departingfro'm'the spirit or scope of the invention,as expressed in the following claim.

What I claim is: V I In combination, an expansion shield formed of metalof uniform thickness and having tapered expansible portions providedwith an external annular projection, sur- 7 rounding the taperedportions, an expanding element movable longitudinally in the shieldwithin said annular projection, and means for holding said expandingelement from rotation as said element moves longitudinally in theshield.

i In Witness whereof, I have hereunto set my hand this 17th day ofJanuary, 1927.. V

. 7 CHARLES C. TOMKINSON.

